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Core region of Arctic Oscillation and the main atmospheric events impact on the Arctic

机译：北极涛动的核心区域和主要的大气事件对北极的影响

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摘要

Arctic Oscillation (AO) is a seesaw pattern in which sea level pressure (SLP) at the polar and middle latitudes in North Hemisphere fluctuates between positive and negative phases. It has been used as a representative atmospheric circulation index to express climate change. The purpose of this paper is to reveal the regional difference of SLP variation. By calculating the correlation coefficients of AO Index with all the gridded SLPs, we have uncovered a special region named as Arctic Oscillation Core Region (AOCR), where the running correlation coefficients (RCC) between gridded SLP and AO index are all negative. The averaged SLP of this region correlates significantly with the AO index. The correlations between local SLPs and AO index outside of AOCR are weaker than those inside. RCC analysis reveals several strong discrepant events different from AO. These events occurred in the years of 1954, 1955, 1962, 1971, 1982/83, 1995, 1996/97, 1998, and 1999. A comparison of these events and the ENSO or PDO indices suggests that the events in 1982/83 and 1998 are probably associated with the ENSO processes. Events centered in other years are likely connected with PDO, which reached their minima in the years of 1950, 1955, 1962 and 1971. The result in this study provides an alternative insight to look at the mechanism of the variation of Arctic Oscillation.
机译：北极涛动（AO）是一种跷跷板模式，北半球极地和中纬度的海平面压力（SLP）在正相位和负相位之间波动。它已被用作代表气候变化的代表性大气环流指数。本文的目的是揭示SLP变化的区域差异。通过计算所有网格化SLP的AO指数的相关系数，我们发现了一个名为北极涛动核心区域（AOCR）的特殊区域，其中网格化SLP与AO指数之间的运行相关系数（RCC）均为负。该区域的平均SLP与AO指数显着相关。 AOCR外部的本地SLP与AO指数之间的相关性比内部的弱。 RCC分析揭示了几个与AO不同的强烈差异事件。这些事件发生在1954、1955、1962、1971、1982 / 83、1995、1996 / 97、1998和1999年。这些事件与ENSO或PDO指数的比较表明，1982/83年和1998年可能与ENSO流程有关。以其他年份为中心的事件很可能与PDO有关，PDO在1950年，1955年，1962年和1971年达到了极小值。本研究的结果为研究北极涛动变化的机制提供了另一种见解。

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